TI-Basic 84 Programming/Conditional Functions

If, PRGM:CTL:1, is a command that, when it's condition is true, will execute the next line of code. If the condition happens to be false, then the program will skip to the second line of code after the statement.

Else, PRGM:CTL:3, is a command that, when a previous If statement is not met, will execute the next line of code. If the condition happens to be false, then the program will skip to the second line of code after the statement.